Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/9058#discussion_r41700341
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala ---
@@ -1239,6 +1254,24 @@ object SQLContext {
instantiatedContext.compareAndSet(null, sqlContext)
--- End diff --
@davies Seems when we create a sql context for a new session,
instantiatedContext will be set to the context representing that session. Do
you think if it makes sense to use instantiatedContext hold the root sql
context (the one created directly from user-facing constructor instead of
newSession)?
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